EP0744267A2 - Method for monitoring and/or controlling an injection moulding machine - Google Patents

Abstract

This process monitors and/or controls a pressure injection moulding unit. Desired settings are loaded manually into the computer associated with the machine. Alternatively or in addn., other fixed predetermined input values form the so-called desired operating profile curves and/or desired points with defined positions are input. During an injection cycle process parameters are measured by sensors and supplied to the computer, to construct the so-called actual profile curves. Process monitoring or control is carried out by comparison of actual and desired profiles and/or corresp. points. Also claimed is a measurement system, essentially as described in the procedure.

Description

The invention relates to a method for process monitoring and / or control of a die casting machine.

State of the art

From the literature foundry 68 (1981) No. 18, page 531 ff., Automatic casting process monitoring during die casting has become known, which shows the basic method of die casting control or monitoring. The casting process monitoring systems known up to that point assume that actual values of the most varied parameters measured during the current casting process are compared with predetermined target values and, if necessary, corrections for adapting z. B. an actual value curve can be performed on a setpoint curve.

From a further known method for monitoring the injection process in a plastic injection molding machine according to EP 0 128 722 B1, parameter values are used in the manufacturing process as reference data to form a reference curve for such manufactured products that were rated as castings with still good quality. At In later series production, the measured actual data are then compared with the predetermined reference data determined in this way, tolerance limits determining the still permissible deviations.

The running-in of a new die-casting mold is therefore associated with an extensive experimentation phase in order to obtain usable setting and reference values for later series production. This experiment phase is carried out by manually entering a wide variety of parameters, i. that is, the actual series production is preceded by a test production with manually entered parameters.

With regard to the machine control of a die casting machine and the associated control curves, reference is also made to the reference Ernst Brunnhuber: Praxis der Druckgußfertigung 1980, page 82 ff. In particular, on page 93 ff. The measuring technique of the casting drive is explained, according to which a measurement and recording of the casting piston travel and the casting piston pressure are carried out as a function of time. The casting piston speed can be evaluated and calculated from the piston travel measured as a function of time, in a measuring computer, and the result is generally displayed digitally. The pressure is measured using a pressure sensor on the drive cylinder, which is also connected to the measuring computer. This measures the pressure, time and speed of the plunger.

Reference is also made to EP 361 837 B1 (Ube), in which the casting process is controlled by specifying a travel-time setpoint curve of the casting piston, the actual stroke movement of the ram being regulated in the sense of following the setpoint curve.

A real-time controlled casting unit has become known from the literature foundry 79, 1992, No. 9, April 27, pp. 347-354. A measuring device itself is not described in detail. On page 349 of this reference a programming of the switchover to pressure control with a "falling pressure edge" is described. Switching takes place after reaching a waypoint, after reaching a pressure and after reaching a certain speed.

On page 350 of this reference, a relationship between waypoints and speed points is shown in a typical casting curve display. However, no reference is made to the evaluation process in a measuring device. In particular, this reference does not contain any information as to how measurement curves are automatically evaluated in relation to the machine setting.

Also from the literature foundry 80, 1993, No. 8, April 19, pp. 247-252, there is no indication of how an automatic evaluation of measurement curves in relation to the machine setting should be carried out in detail.

In order to understand the invention, the following is generally pointed out:

In the automatic evaluation of measurement curves on die casting machines, a distinction is made between so-called unregulated and regulated die casting machines.

Uncontrolled die casting machines are set, for example, by recording and monitoring various parameters in a measured value recording system, these being evaluated using statistical methods. For example, functions p (t), s (t) and v (t) can be present as a measurement diagram and for the die casting process relevant parameters are displayed in digital form. These digital values are automatically determined from a die-casting curve. As a result, z. B. the determination of the switchover point between the first and second die casting phase at the first abrupt change in the travel signal. Furthermore, the hold pressure phase and the hold pressure delay can be easily taken from the curves. The digitally available values can be processed further by the measuring computer and evaluated by statistical methods.

). Zu charakteristischen Schaltpunkten bzw. Gießkolbenstellungen wird demnach die zugehörige Sollgeschwindigkeit eingegeben, wobei eine Rampenfunktion berücksichtigt werden kann. Diese Soll-Profilkurve kann über den gesamten Verlauf des Druckgießvorgangs, d. h., über die Vorlaufphase der Formfüllphase und der Nachdruckphase eingegeben werden. Eine in den Meßrechner eingegebene Soll-Profilkurve $\text{f = v (s)}$

ist allerdings mit der im Meßrechner angezeigten Ist-Kurve $\text{f = v (t)}$

nicht direkt vergleichbar. Es müssen demnach Anpassungsmaßnahmen getroffen werden.Regulated die casting machines can be used to set the casting unit using profile curves. The die casting machine can be programmed, for example, by entering a target profile curve for the speed ( $\text{f = v (s)}$

). The associated setpoint speed is accordingly entered for characteristic switching points or casting piston positions, a ramp function being able to be taken into account. This target profile curve can be entered over the entire course of the die casting process, ie over the lead phase of the mold filling phase and the post-pressure phase. A target profile curve entered into the measuring computer $\text{f = v (s)}$

is however with the actual curve displayed in the measuring computer $\text{f = v (t)}$

not directly comparable. Adjustment measures must therefore be taken.

Object of the invention

The invention has for its object to propose a method by means of which the target profile curves for the setting of the die casting machine in the measuring computer can be automatically compared with the actual curve. In particular, it is also an object of the invention to carry out a time coordination between target profile curves and actual profile curves in the measuring computer, independently of triggering (start). the measured value recording. Tolerance limits should be taken into account when comparing the target and actual profile curves. By specifying a master curve in the measuring computer, any points that are available for evaluation should be able to be selected using a simple method, and any intermediate values may also be included.

This object is achieved by the features in particular of claim 1. Advantageous and expedient developments and additions to the invention are specified in the further claims.

Advantages of the invention

Accordingly, in the present invention, an automatic comparison of the setting parameters of a casting unit with the measured casting parameters takes place. The peculiarity of the measuring device lies in the fact that all setting data (target values) of the casting unit are generated in measuring computers in such a way that an instant automatic comparison with the setting data or the setting curves can take place after recording actual curves.

A special feature is that the setting data of the die casting machine consist of a table entry from which a speed profile curve can be derived and the individual speed points are assigned to the corresponding piston positions. The measuring system then records the speed curve as a v / t curve, the actual speed being determined by the measuring system in such a way that perpendicular rays are placed on the individual relevant points entered on the s / t curve and that the actual speed values can be determined automatically at the intersection with the v / t curve.

In an alternative embodiment, the setting data of the die casting machine can consist of a tabular input from which a pressure profile curve can be derived. The individual pressure points are assigned corresponding time values after "pouring plunger stop" at the end of the mold filling.

The measuring system records the pressure curve as a p / t curve, the measuring point “pouring piston stop” in particular being formed by the falling pressure flank on the piston rod side of the casting cylinder. On the basis of this signal, a vertical beam T0 is generated by the measuring system. Additional vertical rays are generated in the measuring system on the time periods (T0 + X) that were defined when the pressure profile table was entered. The intersections with the actual pressure curve are compared with the tabular setting values of the machine setting and evaluated.

Another special feature of the invention is that when the machine setting data is entered by the operator, upper and lower tolerance limits can be entered at the same time. The measuring system is then based on the special features that the tolerance limits on the beams are automatically displayed in the measurement record as described above, and the deviation from the target value can be represented digitally as a numerical value.

Further details and advantages of the invention are explained in more detail in the following description of exemplary embodiments with the aid of drawings. The drawings contain both data diagrams and graphical curve representations.

Description of exemplary embodiments of the invention

• Geschwindigkeitsprofilkurve
• Druckprofilkurve

For example, the following profile curves can be run on a controlled die casting machine:

• Speed profile curve
• Pressure profile curve

dargestellt, wie dies in der Fig. 2 wiedergegeben ist. Hier handelt es sich demnach um Ist-Profilkurven.The setting data of the die casting machine are transmitted to a measuring computer in a known manner via a corresponding interface. To manufacture z. B. a speed profile as a target curve, the measuring computer z. B. the data shown in FIG. 1 are available. In column 1 of this table, characteristic waypoints of the pouring plunger position are shown as points 1 to 4, which correspond to the position of the pouring plunger indicated in column 2. A target speed specified in column 3 is specified for these positions, the presence of a ramp with the letter J (yes) and no ramp with the letter N (no) being described in more detail. Limit values are entered manually in the two right columns, whereby minimum and maximum limit values are defined. With regard to the path and speed data, there is an automatic data transfer from the die casting machine setting. The data specified in FIG. 1 are shown in a table in the measuring computer, the specified limit values being added by manual input. 1 a shows a graphical representation of the tabular target values according to FIG. 1, in particular also with the ramp formation by the specified angles α, β. The curves are now in the measuring computer for each casting cycle or shot $$\begin{array}{c}\begin{array}{c}\text{f = s (t) as well}\\ \text{f = v (t)}\end{array}\end{array}$$

shown as shown in Fig. 2. Accordingly, these are actual profile curves.

In this diagram according to FIG. 2, according to the invention, in the s (t) and v (t) diagram, the respectively associated actual speed point 1 'to 4' is assigned to a given waypoint of points 1 to 4 from FIG. 1. This is shown graphically in FIG. 2 by an arrow from point 1 to point 1 'to point 4 to point 4'. The speed points 1 'to 4' on curve v (t) measured in this way and shown in FIG. 2 are shown in tabular form in the measuring computer and are automatically evaluated after the entry of tolerance limits, as shown in FIG. 3.

In the tabular comparison according to FIG. 3, the target speeds in points 1 to 4 or the associated positions according to column 2 in FIG. 1 are compared graphically from the distance-speed profile set out in FIG. 1 with those from FIG. 2 determined actual speeds in points 1 'to 4', which have been determined for the associated points 1 to 4 in FIG. 2. For example, the target speed in point 3 according to the table in FIG. 1 is 3.5 m / s, while the actual speed determined in FIG. 2 in point 3 is 3.4 m / s. The tolerance field or the limit values in FIG. 1 were set to min. 3.4 and max. 3.6 m / s. The actual speed measured at 3.4 m / s is therefore within the specified tolerance range.

At point 2, that is, in the 300 mm position of the casting piston, for example, a target speed of 3.5 m / s according to FIG. 1 is specified. At this target speed, an actual speed at point 2 'of 3.7 m / s is determined in accordance with the measured s (t) and v (t) actual curves with an associated piston position of 300 mm. After the limit values between 3.4 and 3.6 m / s were determined for this point 2 (see FIG. 1), the value of the actual speed in point 2 of 3.7 m / s lies outside of Tolerance limit. This is indicated in Fig. 3 by a tolerance violation in point 2 (hatched field).

3 therefore again contains the tabular values of FIG. 1 as target values for the speed at certain points or positions of the casting piston. Likewise, the limit values from FIG. 1 are again included in FIG. 3. The actual speeds determined from FIG. 2 are added to these target values in FIG. 3 in the individual points, which are determined, for example, in points 1 to 4 in the case of the pouring plunger positions 200, 300, 600 and 650 mm in a graphical and tabular manner. This determination of the actual speed on the curve v (t) to the associated points 1 to 4 is shown in FIG. 2 by the representation of the points 1 'to 4'.

According to the representation of the invention according to FIG. 4, FIG. 4 a, in addition to the characteristic waypoints 1 to 4 shown in FIGS. 1 and 3, the z. B. have been determined by the machine setting, any other intermediate values can be monitored using the same method. For example, in the table according to FIG. 4 according to FIG. 1 a in connection with FIG. 4 a, two intermediate points 5 and 6 at the travel position 100 or 150 mm are manually defined. When these intermediate waypoint values are entered, the measuring computer then calculates the associated setpoint speed by interpolation, ie the setpoint speed is interpolated at point 5 with 0.05 m / s and at point 6 with 0.075 m / s. If these path / speed values are fixed, a comparison can again be made with the measured profile curves s (t) and v (t) according to FIG. 2, ie, at the specified positions 100 and 150 mm, the s (t) -actual is -Curve points 5 and 6 are determined at these path positions and the associated speed values are determined on the actual speed curve v (t). These Speed values are shown at 5 ', 6' in Fig. 2. These ascertained actual speeds can then again be shown in the table according to FIG. 4, which takes place analogously to the previously described method according to FIGS. 2 and 3.

The method previously described for speed profile curves can also be carried out analogously for pressure profile curves. This is explained in more detail below.

Analog to the table of FIG. 1 are the measuring computer of the die casting machine, the z. B. in Fig. 5 setting data available as target data. The items listed in the left column of this table are characteristic setting points or switching points, which are determined by the machine setting. There is again an automatic data transfer from the die casting machine setting with a determination of the desired pressure depending on the time and the specification of a ramp. The limit values specified in the two right-hand columns of FIG. 5 are also entered manually. A corresponding graphical representation of the p (t) target profile curve according to the table in FIG. 5 is shown in FIG. 6.

Characteristic of the table according to FIG. 5 is the choice of the "point in time zero" at point 1, which is chosen between the mold filling phase and the holding pressure phase in accordance with the almost stoppage of the casting piston (see FIG. 6). This zero time is selected for the activation of the pressure profile. This data is displayed in a table in the measuring computer and can be given the minimum or maximum limit values by manual input.

als Ist-Profildruckkurve gemessen und aufgezeichnet. Dieser gibt z. B. eine in der Fig. 9 dargestellte Druck/Zeitkurve. Um die nach Fig. 9 gemessene Ist-Kurve mit der im Meßrechner gespeicherten Sollkurve nach Fig. 6 entsprechend den Werten nach Fig. 5 vergleichen zu können, muß gemäß obiger Ausführung auf der gemessenen Kurve nach Fig. 9 der "Zeitpunkt Null" für die Aktivierung des Druckprofils festgelegt werden. Dies geschieht beispielsweise durch das nachfolgend beschriebene Verfahren:The function is now in the measuring computer for each casting cycle or shot $\text{f = p (t)}$

measured and recorded as the actual profile pressure curve. This gives z. B. one in FIG. 9 shown pressure / time curve. In order to be able to compare the actual curve measured according to FIG. 9 with the target curve stored in the measuring computer according to FIG. 6 in accordance with the values according to FIG. 5, the "zero time" for the measured curve according to FIG Activation of the pressure profile can be set. This is done, for example, using the procedure described below:

In the casting unit 11 shown in FIG. 7, the speed of the casting piston 12 is regulated by means of a servo valve 13. During the movement of the casting piston 12, a hydraulic sensor is located on a pressure sensor 14 arranged on the side 24 of the hydraulic drive piston 25 opposite the pressure side 23 Pressure which is dependent on the drive pressure of the hydraulic accumulator 15 and on the speed of the casting piston 12. Towards the end of the mold filling phase, the mold is filled with metal and the casting piston 12 almost comes to a standstill. At this moment, the pressure on the transducer 14 is suddenly lowered to approximately zero bar. This lowering of the pressure at the pressure sensor 14 is selected together with a path specification on the casting piston 12 as a signal for the measuring computer for the “zero time” which is used to activate the target profile curve on the actual profile curve. The path specification is required as a logical condition in order to ensure that the pressure drop at the pressure sensor 14 is only used as a measurement signal over a precisely defined path. Pressure drops before this distance therefore do not meet the logical condition and are not taken into account for the activation of the "point in time zero". 8 shows this pressure curve at the pressure sensor 14 as a function of time as well as the casting piston travel over time.

The following relationship exists for the pouring piston path: $$\begin{array}{c}\begin{array}{c}{\text{s}}_{\text{k}}{\text{= Piston stroke with the mold closed (e.g. S}}_{\text{k}}\text{= 900 mm)}\\ {\text{s}}_{\text{F}}\text{= Starting point for the activation of the logical conditions for determining the time zero;}\end{array}\end{array}$$

If you set a constant increment, consisting of the maximum remaining casting thickness and a safety margin of z. B. 120 mm, it results $${\text{s}}_{\text{F}}{\text{= s}}_{\text{k}}\text{- 120 mm = 900 - 120 = 780 mm.}$$

From the point S _F = 780 mm, the logical condition is activated. The logical condition for the time zero is fulfilled at s _F (actual) if a pressure threshold of p z. B. 10 bar is met.

The actual value of the pouring piston path S _F (actual) and the actual value of the pressure sensor P _(actual) are transmitted to the measuring computer. If the logical condition for the activation of the "point in time zero" is fulfilled, this time value is recorded and stored by the measuring computer. After the curves have been recorded in the data memory of the measuring computer, the curves are displayed on the screen, together with the identification of the activation for the "time zero" in the form of the curve shown in FIG. 9.

8 shows the constant pressure p1 in the pressure sensor 14 according to FIG. 7 as long as the casting piston 2 is still standing (s1 = 0). At time t1, the casting piston starts its forward movement (arrow 16) and there is a linear path movement over time along path curve 17. During this phase there is a gradual pressure reduction along the pressure curve 18 until the end of the mold filling phase at point 19. At this point, the casting piston 12 almost comes to a standstill (point 20) and the abrupt pressure drop from point 19 to point 21 described above takes place in Fig. 8 instead. Here is a in point 22 Pressure threshold of e.g. B. 10 bar selected as the switching threshold for determining the "zero point", which occurs only from the path increment S _F and the respective exact location is defined as S _F (actual).

In the actual pressure profile curve measured in FIG. 9, the target points of the pressure profile curve are assigned to the time zero in a second step by the measuring computer and displayed on the screen. This results in the representation according to FIG. 10, i. That is, starting from the "time zero", the determination of which is described above, the setpoints of points 1 to 5 given in the table in FIG. 5 are inserted into the diagram of the measured actual curve in FIG. 9, so that the 10 results. This enables an exact comparison of the target pressure profile curve with the actual pressure profile curve. This results directly from the illustration in FIG. 10.

In a further development of the invention, the minimum and maximum limit values entered in the table according to FIG. 5 can be plotted on the target curve according to FIG. 10. If the actual curve is intersected with the limit ranges entered, the tolerances are not exceeded. This is shown analogously in FIG. 11. In the exemplary embodiment according to FIG. 11, point 1 lies outside the tolerance, for example. All other points are within the tolerance band.

It is also possible to manually enter any further monitoring points in the table according to FIG. 5. These monitoring points are also displayed on the screen of the measuring computer. In FIG. 11, this is point 6, for example. These manually entered points enable e.g. B. monitoring the pressure during an edge. This means that all data are available to the measuring computer for the speed and speed entered on a controlled casting unit Compare pressure profile curves in a simple manner and without manual programming of the measuring computer, examine them for tolerance violations and apply all known statistical methods.

According to the invention, so-called “master curves” can be used instead of entered target profile curves, which result as profile curves of measured parts of good quality. These “master curves” can be stored in the computer and compared with measured actual values analogously to the method described above and be evaluated.

oder $\text{f = p (t)}$

mittels eines Cursor abzufahren und an jeder beliebigen Stelle den relevanten Wegpunkt oder Druckpunkt als Sollpunkt vorzugeben. Aus diesem so vorgegebenen Sollpunkten wird wiederum, wie zuvor beschrieben, der Vergleich zwischen Ist- und Sollpunkten bzw. Ist- und Sollkurven durchgeführt.It is also possible to use the master curves $\text{f = v (t)}$

or $\text{f = p (t)}$

move with a cursor and specify the relevant waypoint or pressure point as the desired point at any point. As previously described, the comparison between actual and target points or actual and target curves is in turn carried out from this predetermined target points.

The invention is not restricted to the exemplary embodiment shown and described. Rather, it also encompasses all professional further training and modifications within the framework of intellectual property rights claims.

Claims (20)

Process monitoring and / or control method for the casting unit of a die casting machine, - In a computer of the die casting machine, manually entered, desired setting values and / or other predetermined input values form so-called target profile curves and / or target points with defined positions, - wherein during a casting cycle process parameters are measured by transducers and fed to the measuring computer and form so-called actual profile curves, a process monitoring or control is carried out by comparing the actual profile curves with the target profile curves and / or corresponding points,
characterized,
that for a comparison of actual and target profile curves, an assignment of the casting piston speed to the casting piston path and / or of the casting piston pressure to the casting piston path or to the associated casting time for measured actual values takes place and that by means of input values and / or master curves, predetermined comparison values to any, however Matching path positions of the casting piston or associated casting times associated setpoints are compared with the actual values in the computer taking into account tolerances. A method according to claim 1, characterized in that for a comparison of the actual and target speed profile curves of the casting piston in the computer for a working cycle, a first actual profile curve for the plunger path depending on the time ( $\text{f = s (t)}$

) - and a second actual profile curve for the piston speed as a function of time ( $\text{f = v (t)}$

) is determined - That to any, but corresponding path positions of the casting piston from measured actual displacement values of the casting piston ( $\text{f = s (t)}$

) the associated actual speed values of the casting piston ( $\text{f = v (t)}$

) determined by the computer and these speed-actual values determined in this way, possibly taking into account the tolerance limits entered, are compared with the speed target values of the casting piston in the comparison positions. Method according to Claim 1 or 2, characterized in that setpoint values for the pouring piston speed are entered in a table as a function of the pouring plunger path, possibly including tolerance limits, and in that the actual speed values of the casting piston determined by the computer at specific path positions are compared with the target speed values stored in the computer are compared in the same path position, taking tolerance limits into account, and that actual speed values of the casting piston determined outside the tolerance limit are evaluated as errors. Method according to Claim 1, characterized in that, in addition to a comparison of actual / target speed profile curves with specific casting piston positions or casting times, a comparison of actual / target pressure profile curves is carried out. Method according to claim 4, characterized in that the starting time for recording the actual pressure profile curve is variable, a "zero point determination" being carried out for a comparison of the actual and target pressure profile curves. Method according to Claim 4 or 5, characterized in that a setpoint pressure data of the casting piston pressure are entered in a table as a function of the casting time, in order to form a set profile pressure curve in the measuring computer, the actual time and setpoints being timed as "zero time" The pouring plunger almost comes to a standstill after the mold filling phase over a defined distance (S _K - S _F ) of the pouring plunger and preferably minimum / maximum limit values can be defined as tolerance limits. Method according to Claim 5 or 6, characterized in that the casting assembly (11) of the die casting machine has a pressure sensor (14) on the side (24) of a hydraulic piston (25) opposite the pressure side (23), by means of which the piston piston movement of the hydraulic piston (15) dynamic pressure generated is recorded as a function of time and fed to the computer, the time of the actual pressure profile curve being used at the time when the actual pressure profile curve is used for the relative "zero point adjustment" of the actual pressure profile curve and the desired pressure profile curve, at which the piston movement of the hydraulic piston (25 ) generated dynamic pressure drops suddenly to almost zero. Method according to one of the preceding claims, characterized in that the actual and / or target path or speed profile curves and / or the actual and target pressure profile curves are displayed on a screen. Method according to one of the preceding claims, characterized in that the input of the setpoints takes place via a machine computer of the die casting machine, which feeds this data to a measuring computer, the machine computer taking over the machine control. Method according to one of the preceding claims, characterized in that the target and actual profile curves recorded in the measuring computer can be recorded and output in tabular and / or graphic form. Method according to one of the preceding claims, characterized in that the desired target speed and / or target pressure profile curves have a ramp in certain curve profiles. Method according to one of the preceding claims, characterized in that any intermediate positions can be set between switching points or comparison points of the casting piston position or the casting time determined by the machine setting for an actual-target comparison, the associated profile curve points being determined by computer interpolation. Method according to one of the preceding claims, characterized in that instead of the desired setting values entered into the computer of the die casting machine for the formation of target profile curves, pressure casting curves determined for alternative products are used as "master curves" and the "master target profile curve" thus obtained is also used measured actual profile curves is compared. A method according to claim 13, characterized in that a master speed profile curve and / or a Master pressure profile curve determined and used as target profile curve. Method according to one of the preceding claims, characterized in that a cursor is moved on a path and / or speed and / or pressure profile curve in the measuring computer and that the measuring computer determines the position of the casting piston at each cursor position, and that it determines the position Actual profile values can be compared with the corresponding target profile values for the same casting piston position. Measuring system for automatic comparison of the setting parameters of a casting unit with measured casting parameters, characterized in that all setting data (target values of the casting unit) can be generated in such a way that, after recording actual curves, an immediate automatic comparison with the setting data or setting curves takes place. Measuring system in particular according to claim 16, characterized in that a speed profile curve can be represented in a tabular input of setting data of a die casting machine, in which speed points are assigned to the position of the casting piston, an actual speed curve being recorded as a v / t curve and the determination the actual speed for certain points or piston positions can be achieved by generating vertical rays on the individual relevant entered points on the s / t curve created by the measuring computer, and the actual speed values at the intersection with the v / t curve can be determined automatically. Measuring system for the automatic comparison of the setting parameters of a casting unit with the measured ones Casting parameters, the setting data of the die casting machine consisting of a tabular input from which a pressure profile curve can be derived, for displaying a p / t curve and the corresponding pressure values being assigned to the individual pressure points after "casting piston stop" at the end of the mold filling phase, characterized in that the measuring point "casting piston stop" is formed by the falling pressure flank on the piston rod side of the casting cylinder. Measuring system according to claim 18, characterized in that the measuring point "pouring plunger stop" is detected as a measuring signal and can be generated by the measuring system as a vertical beam T0, that further vertical beams can be generated in the measuring system over the time period T0 + X, which were defined when the pressure profile table was entered and that the intersections with the actual pressure curve are comparable and evaluable with the tabular setting data of the machine setting. Measuring system according to one or more of the preceding claims, characterized in that upper and lower tolerance limits can be entered at the same time when entering machine setting data, the tolerance limits being automatically indicated in a measurement record and deviations from the target value being digitally representable as a numerical value.

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